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LESSON 5
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Linear Structure
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We've Already Worked With It!

Programs written so far have used a linear structure, which is represented by a sequence of instructions that execute every time we run the Python code, regardless of the input values.

We have read input data, assigned values, performed calculations, and displayed the result in the console.

EXAMPLE

Let's assume we want to create a program that reads three integers from the keyboard and displays their arithmetic mean.

The calculation formula is simple. For a, b, and c, the arithmetic mean is:



How do we approach designing the algorithm?

Well... first we read the three values and store them as integers in the three variables, a, b, and c. We can define a variable ma which will hold the arithmetic mean using the expression (a+b+c)/3. Finally, we display the result, which is the value stored in ma!

Look at the logic diagram below. Let's assume the values 9, 10, and 8 were entered:


Execute schema

Nothing simpler than to write it now in Python:
Editor - lesson_5.py
       
Console / Output done
PROPOSED EXERCISE

Modify the algorithm above to display the geometric mean of the three numbers, using the following formula:



Next, we will study some basic linear algorithms together.
Execute the diagram, the program, and solve the exercise.
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